DOC AIRBUS | TSM A320FFailure of the HPC Stage 7 Solenoid Valve on Engine 1
1. Possible Causes
NOTE: This task is to troubleshoot the Clear Language Message (CLM) 7TH BLD D SOL/HC/EEC1. The fault code
(for A1 engines) or fault acronyms (for A5 Engines) listed in the fault confirmation section below will help
you to focus on the correct cause of this CLM.
· VALVE-HPC STAGE 7 SOLENOID ( 4020KS2 )
· EEC ( 4000KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-60-00-860-001 EIS Start Procedure
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 70-23-15-912-010 Connection of Electrical Connectors
Ref. AMM 71-13-00-010-010 Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-50-00-210-010 Wire Harness Visual Inspection - All Power Plant Electrical Cables
Ref. AMM 73-22-00-710-040 Operational Test of the FADEC SYSTEM on the Ground
Ref. AMM 73-22-34-000-010 Removal of the Electronic Engine Control (EEC)
Ref. AMM 73-22-34-400-010 Installation of the Electronic Engine Control (EEC)
Ref. ASM 73-25-18
Ref. AMM 75-32-51-000-013 Removal of the HPC Stage 7 Solenoid Valve
Ref. AMM 75-32-51-400-013 Installation of the HPC Stage 7 Solenoid Valve
70-00-00-03-13 STANDARD PRACTICES - ENGINE - GENERAL - TASK SUPPORTING
DATA
Failure of the HPC Stage 7 Solenoid Valve SHEET 1
HPC Stage 7 Solenoid Valve on Engine 1 SHEET 1
Figure 73(IAE)-00-00-991-02100-A / SHEET 1/1 - HPC Stage 7 Solenoid Valve on Engine 1 not
printed, as per printing preferences
Figure 73(IAE)-00-00-991-01400-A / SHEET 1/1 - Failure of the HPC Stage 7 Solenoid Valve not
printed, as per printing preferences
3. Fault Confirmation
Subtask 73-00-00-860-106-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) Open the fan cowl doors 437AL and 438AR Ref. AMM 71-13-00-010-010 .
(3) On the ECAM control panel, set the Upper ECAM Display Unit (DU) and the Lower ECAM DU
potentiometers to ON Ref. AMM 31-60-00-860-001 .
(4) On MAINTENANCE panel 50VU, set the ENG FADEC GND PWR 1 pushbutton switch to the ON
position.
Subtask 73-00-00-710-320-B
B. Identify the test to make sure that the fault is present.
NOTE: The HPC stage 7D solenoid controls the 7B bleed valve.
NOTE: The Troubleshooting can start immediately without doing the fault confirmation if this CLM was
shown in multiple flight/ground legs.
(1) Do the CFDS message decoding to identify the fault acronym related to the CLM message
(Ref. TSM 70-00-00-03) .
(2) If the readout gives fault acronym B7DWAF in FADEC 1A or FADEC 1B, do the operational test of the
FADEC system on the ground for fault confirmation Ref. AMM 73-22-00-710-040 .
(a) If the test gives fault acronym B7DWAF in FADEC 1A or FADEC 1B, or there are two or more
occurrences in fault history, continue with fault isolation Para 4.A.
(b) If the test does not give fault acronym B7DWAF, and there is no history of faults, send the engine
back to service.
4. Fault Isolation
(Ref. Fig. Failure of the HPC Stage 7 Solenoid Valve SHEET 1) (Ref. Fig. HPC Stage 7 Solenoid Valve on
Engine 1 SHEET 1)
Subtask 73-00-00-810-084-B
A. Fault Isolation for Fault Acronym B7DWAF
A solenoid Wrap Around Fault (WAF) was found in channel A. The circuit for the VALVE-HPC STAGE 7
SOLENOID is open, short to ground or has a wire-to-wire short.
NOTE: At any time during this procedure, you can do the steps in Para 3. to make sure that the fault is
corrected.
NOTE: The removal and/or installation of the electrical connectors can correct this fault.
(1) If the fault was found in channel A, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J5) to the VALVE-HPC STAGE
7 SOLENOID ( 4020KS2 ) Ref. AMM 71-50-00-210-010 .
1 Look for harness damage.
2 Look for loose or damaged connectors.
3 Look for loose or damaged backshells.
NOTE: Loose backshells must be disassembled and examined for internal wiring chafing.
4 If a problem is found with the harness, repair or replace it as necessary.
WARNING: MAKE SURE THAT THE FADEC IS DE-ENERGIZED. IF IT IS ENERGIZED, THERE IS
A RISK OF INJURY OR DAMAGE.
(b) If no problems are found with the harness, disconnect the electrical connector (4020KS2-A) from
the VALVE-HPC STAGE 7 SOLENOID ( 4020KS2 ) Ref. AMM 71-50-00-210-010 . Examine the
male and female parts of the connection:
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for elongated sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each suspect socket. You
must feel friction when you insert and remove the pin.
4 Repair as necessary.
(c) Do this electrical check of the channel A solenoid circuit in the VALVE-HPC STAGE 7
SOLENOID Ref. ASM 73-25-18.
1 Make sure that contacts 3 and 4 are not shorted to ground.
2 Make sure that contacts 3 and 4 are not shorted to any other contacts in the connector.
3 Make sure that the resistance from contact 3 to contact 4 is between 41 and 77 ohms.
4 If a problem was found, remove and replace the VALVE-HPC STAGE 7
SOLENOID ( 4020KS2 ) Ref. AMM 75-32-51-000-013 and Ref. AMM 75-32-51-400-013 .
(d) If no problems were found, disconnect the electrical connector (4000KS-J5) from the
EEC ( 4000KS ) Ref. AMM 71-50-00-210-010 . Examine the male and female parts of the
connection.
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for elongated sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(e) Do this electrical check of the solenoid wiring in the channel A harness. Look for:
1 Wire-to-wire shorts and shorts to ground.
· Wire-to-wire short check: Measure the resistance between the wires. If the resistance is
less than 100000 (100K) ohms, then the wires are shorted and it must be repaired.
· Wire-to-ground short checks: Measure the resistance between the wire and the harness
backshell. If the resistance is less than 100000 (100K) ohms, then the wire is shorted to
ground and it must be repaired.
2 Continuity.
· Continuity check: Measure the resistance between the ends of the same wire. If the
resistance is more than 10 ohms, then the wire must be repaired.
NOTE: An incorrectly wired harness can cause this problem. When you test these circuits,
make sure that the contacts are installed in the correct positions in each connector
as specified in the wiring diagram.
HPC Stage 7 Solenoid Valve Circuit Channel A Harness
HPC Stage 7 Solenoid Valve (4020KS2) EEC (4000KS)
4020KS2-A 4000KS-J5
Contacts Contacts
3 N
4 f
3 If a problem exists with the harness, repair or replace it as necessary Ref. ASM 73-25-18.
(f) Install all the removed connectors Ref. AMM 70-23-15-912-010 .
(g) Do the test for this fault, listed in Para 3. for fault confirmation.
1 If the test does not give fault acronym B7DWAF, send the engine back to service.
2 If the test gives fault acronym B7DWAF , remove and replace the VALVE-HPC STAGE 7
SOLENOID ( 4020KS2 ) Ref. AMM 75-32-51-000-013 and Ref. AMM 75-32-51-400-013 .
3 If this fault continues, remove and replace the EEC ( 4000KS ) Ref.
AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
Subtask 73-00-00-810-230-B
B. Fault Isolation for Fault Acronym B7DWAF:
· A solenoid Wrap Around Fault (WAF) was found in channel B. The circuit for the HPC stage 7 solenoid
valve (4020KS2) is open, shorted to ground, or has a wire-to-wire short.
NOTE: After each step that is done during this procedure, you can do the steps in Para 3. to make sure
that the fault is corrected.
NOTE: The disconnection and connection of the electrical connectors can correct this fault.
(1) If the fault was found in channel B, do the steps that follow:
(a) Visually examine the harness form the EEC connector (4000KS-J11) to the VALVE-HPC
STAGE 7 SOLENOID ( 4020KS2 ) Ref. AMM 71-50-00-210-010 :
1 Look for harness damage.
2 Look for loose or damaged connectors.
3 Look for loose or damaged backshells.
NOTE: Loose backshells must be disassembled and examined for internal wire chafing.
4 If a problem exists with the harness, repair or replace it as necessary.
WARNING: MAKE SURE THAT THE FADEC IS DE-ENERGIZED. IF IT IS ENERGIZED, THERE IS
A RISK OF INJURY OR DAMAGE.
(b) If no problems are found with the harness, disconnect the electrical connector (4020KS2-A) from
the VALVE-HPC STAGE 7 SOLENOID ( 4020KS2 ) Ref. AMM 71-50-00-210-010 .
Examine the male and female parts of the connection:
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for elongated sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(c) Do this electrical check of the channel B solenoid circuit in the HPC stage 7 solenoid valve Ref.
ASM 73-25-18
1 Make sure that contacts 6 and 7 are not shorted to ground.
2 Make sure that contacts 6 and 7 are not shorted to any other contacts in the connector.
3 Make sure that the resistance from contact 6 to contact 7 is between 41 and 77 ohms.
4 If a problem was found, remove and replace the VALVE-HPC STAGE 7
SOLENOID ( 4020KS2 ) Ref. AMM 75-32-51-000-013 and Ref. AMM 75-32-51-400-013 .
(d) If no problems were found, disconnect the electrical connector (4000KS-J11) from the
EEC ( 4000KS ) Ref. AMM 71-50-00-210-010 .
Examine the male and female parts of the connection:
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for elongated sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each suspect socket. You
must feel friction when inserting and removing the pin.
4 Repair as necessary.
(e) Do this electrical check of the solenoid wiring in the Channel B harness.
Look for:
1 Wire-to-wire shorts and shorts to ground.
· Wire-to-wire short check: Measure the resistance between the wires. If the resistance is
less than 100000 (100K) ohms, then the wires are shorted and must be repaired.
· Wire-to-ground short check: Measure the resistance between the contacts and the
harness backshell. If the resistance is less than 100000 (100K) ohms, then the wire is
shorted to ground and must be repaired.
2 Continuity.
· Continuity check: Measure the resistance between the ends of the same wire. If the
resistance is more than 10 ohms, then the wire must be repaired.
NOTE: An incorrectly wired harness can cause this problem. When testing these circuits,
make sure that the contacts are in the correct position in each connector as specified
in the wiring diagram.
HPC Stage 7 Solenoid Valve Circuit Channel B Harness
HPC Stage 7 Solenoid Valve (4020KS2) EEC (4000KS)
4020KS2-A 4000KS-J11
Contacts Contacts
6 N
7 f
3 If a problem is found with the harness, repair or replace it as necessary Ref. ASM 73-25-18.
(f) Install all the removed connectors Ref. AMM 70-23-15-912-010 .
(g) Do the test for this fault, listed in Para 3. for fault confirmation.
1 If the test does not give fault acronym B7DWAF, send the engine back to service.
2 If the test gives fault acronym B7DWAF, remove and replace the VALVE-HPC STAGE 7
SOLENOID ( 4020KS2 ) Ref. AMM 75-32-51-000-013 and Ref. AMM 75-32-51-400-013 .
3 If this fault continues, remove and replace the EEC ( 4000KS ) Ref.
AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
5. Close-up
Subtask 73-00-00-860-107-A
A. Put the aircraft back to its initial configuration.
(1) If necessary, close the thrust reverser halves, and activate the thrust reverser HCU.
(2) Close the fan cowls and remove the warning notices Ref. AMM 71-50-00-210-010 .
(3) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(4) On the overhead panel 50VU, set the ENG/FADEC GND PWR 1 pushbutton switch to the OFF
position.
(5) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 . [Rev.6 from Feb 2017] 2026.04.04 04:36:06 UTC